Maxima Function
untimer (f_1, ..., f_n)
untimer()
Given functions f_1, ..., f_n,
untimer removes each function from the timer list.
With no arguments, untimer removes all functions currently on the timer list.
After untimer (f) is executed, timer_info (f) still returns
previously collected timing statistics,
although timer_info() (with no arguments) does not
return information about any function not currently on the timer list.
timer (f) resets all timing statistics to zero
and puts f on the timer list again.